1) While doing a female doggy style, the male withdraws his penis from the female’s vagina prior to ejaculation during intercourse (coitus interruptus), at which this time, the semen ejaculated onto the female’s back is then being collected in the dimples of the female’s lower back.

2) While doing a girl from behind, the guy pulls out and nuts on the girl’s back. The jizz is then collected in the dimples of the girl’s lower back.

3) Indentations on a girl's lower back that can be used as thumb grips during doggy style prior to becoming filled with semen.